2G Modified front and rear knuckles for inboard tire clearance

Posted by slowwhite, Jun 22, 2017

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  1. slowwhite

    slowwhite Proven Member

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    camden, South Carolina
    I was curious if anyone knows of or does this service and how much?

    I'm at a cross roads. And think it's best to just take the plunge. While I need to buy tires and rims anyways...

    Per John Freund build thread.
    To run RPF1 - 18×10.5 +15

    "Modified front and rear knuckles for inboard tire clearance (this is how I can run the above wheel/tire combos) , currently still requres 5mm spacer in rear"
     

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    Attached Files:

    My DSM:
    1997 Mitsubishi Eclipse GSX

    Road Race Build

    425 whp   lb/ft
    1995 Mitsubishi Eclipse GSX (sold)

    Drag Race Build

    GT35   manual
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  2. orangedsm

    orangedsm Proven Member

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    Joined Oct 30, 2002
    Seattle, Washington
    Bumping this thread.

    My wheels are nowhere near as large or aggressive, but I'm running a much higher offset. I'm trying to get the meatiest tire I can without sticking out past the fenders. So I went with a 17x9 +45 offset RPF1.

    So I'm running into the same issue, my tire is rubbing right on the curved part of the knuckle arm. Has anyone done anything custom with these? I don't want to just go at it with a grinder, and I know a spacer is the easiest way, but I don't want the tires sticking out. I'm willing to spend the money to get something fabbed up, I'll be getting in contact with some local fabricators to see if they are interested. But I wanted to see if anyone has come up with anything already.

    It would be great to get that about 15mm taken out of that curve, but of course I'm not going to mess with the structural rigidity. Could an experienced fabricator modify the knuckle to maintain strength but give me the clearance I want? Or would they have to fabricate an entirely new knuckle?

    Don't mind the old suspension, this is a project car I just picked up, ordered Feal 441's that I'll be installing next week.
    19989720_1434333889949628_3973936088900792361_n.jpg
     
  3. ec17pse

    ec17pse Freelancer

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    London, Europe
    I just seen this thread pop up and shocked i missed it,

    I modified them front knuckles for John and got 10mm of extra tire clearance bu doing that i had to strengthen the rear if the knuckle to make sure it wont collapse,

    I did similer to mine but not as drastic and no support, i got maybe 4-5mm clearance and i did not support the back on mine and its still ok todate.
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    Road Race Build

    175 whp   180.1 lb/ft
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  4. ec17pse

    ec17pse Freelancer

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    You have to have a shop modify them but preceisly as John found out! He had RRT do his rears but in the wrong location so they hit still. Its not easy to make a new knuckle so modifying yours is best. It might be a few hundread to do for modifying due to the process and time doing it but it certainly is 1 way to get more clearance.

    I have not modified my rears as i use a spacer to give me a wider rear track so i have not touched those on my new knuckles to go on
     
    Last edited: Jul 17, 2017
    My DSM:
    1997 Mitsubishi Eclipse GST

    Road Race Build

    175 whp   180.1 lb/ft
    Loading...
    slowwhite likes this.
  5. ec17pse

    ec17pse Freelancer

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    these are a few pics I took when i did Johns knuckles for him, this first pic shows how far back I went and then reinforced it at the back IMAG0779.jpg IMAG0791.jpg
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    Road Race Build

    175 whp   180.1 lb/ft
    Loading...
  6. orangedsm

    orangedsm Proven Member

    146
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    Joined Oct 30, 2002
    Seattle, Washington
    Thanks for these pictures! I'll be in contact with a local fabricator to get this done on front and rear.
     
  7. ec17pse

    ec17pse Freelancer

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    Not a problem, just make sure they are ok to do this and know what they are doing, this is at your own risk of courze when you modify your parts
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    Road Race Build

    175 whp   180.1 lb/ft
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  8. slowwhite

    slowwhite Proven Member

    136
    47
    Joined Oct 27, 2013
    camden, South Carolina
    What material and size plate dI'd you use?

    I have a few parts headed to a welder. And would live to send these off to get done also.
     
    My DSM:
    1997 Mitsubishi Eclipse GSX

    Road Race Build

    425 whp   lb/ft
    1995 Mitsubishi Eclipse GSX (sold)

    Drag Race Build

    GT35   manual
    Loading...
  9. ec17pse

    ec17pse Freelancer

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    London, Europe
    I used 5mm plate and the length was slighty longer then what i marked out i was going grind away, took it over the finish mark of the grinding line to help the strength in that area
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    Road Race Build

    175 whp   180.1 lb/ft
    Loading...
    slowwhite likes this.
  10. slowwhite

    slowwhite Proven Member

    136
    47
    Joined Oct 27, 2013
    camden, South Carolina
    Nice picture on the wall in the background btw - LOL
     
    My DSM:
    1997 Mitsubishi Eclipse GSX

    Road Race Build

    425 whp   lb/ft
    1995 Mitsubishi Eclipse GSX (sold)

    Drag Race Build

    GT35   manual
    Loading...
  11. ec17pse

    ec17pse Freelancer

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    London, Europe
    Haha, eyes away dude! I actually ask for a car one but he never gives me one! Wife laughs at it though
     
    My DSM:
    1997 Mitsubishi Eclipse GST

    Road Race Build

    175 whp   180.1 lb/ft
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  12. 99gst_racer

    99gst_racer Moderator

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    Joined Apr 5, 2003
    Coloma, Michigan
    Bobby, are the knuckles cast iron or cast steel? I've never welded to them before.

    Nice work, BTW.
     
    My DSM:
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  13. ec17pse

    ec17pse Freelancer

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    London, Europe
    They are cast steel, they weld nice but have to be pre heated.

    And thank you, it was the first ones done and i did similer to mine but not as much and no backing plate and its still perfectly fine todate,
     
    Last edited: Jul 17, 2017
    My DSM:
    1997 Mitsubishi Eclipse GST

    Road Race Build

    175 whp   180.1 lb/ft
    Loading...

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